Anyone have experiences with the Bugpack lighweight racing lifters?

[Brandon Sinclair]

I just picked up a pack for like $60 and they look good-better then the other lifters I ran that were twice as much.  I know it will be another crap shoot, but I am willing to give it a shot.  If they go bye bye then I will have to step up to the plate for Udos next time around.

[Jim Ratto]

yeah I use them and last 2165 I had in car went 8600 miles and when I took it down the lifters had no pits.
I have used them, without issue, since 1996. Engle cams turned me onto them. I'm sure if they are subjected to wrong oil, too high of temps, too high of spring pressure, wrong break in, etc... they'll give you problems, but so far, the way I've used them (1300ppm ZDDP+, 160-165lbs @ seat/300 over nose/"no touch" philosophy on cam/lifter engine assembly/good break in). Wish I could say the same about other brands (not mentioning any more about that).
Lifters/oil/etc are topics sure to start a debate. Hopefully it stays civil here (unlike the "other" forum). If guys would stop beating their chests and calm down, we'd all learn something from one another.

ok... next?

[Jim Ratto]

yeah I use them and last 2165 I had in car went 8600 miles and when I took it down the lifters had no pits.
I have used them, without issue, since 1996. Engle cams turned me onto them. I'm sure if they are subjected to wrong oil, too high of temps, too high of spring pressure, wrong break in, etc... they'll give you problems, but so far, the way I've used them (1300ppm ZDDP+, 160-165lbs @ seat/300 over nose/"no touch" philosophy on cam/lifter engine assembly/good break in). Wish I could say the same about other brands (not mentioning any more about that).
Lifters/oil/etc are topics sure to start a debate. Hopefully it stays civil here (unlike the "other" forum). If guys would stop beating their chests and calm down, we'd all learn something from one another.

ok... next?

f.w.i.w, when I was @ BH and built the KG's drag motor we were told by our sensei to run them too. That was with K-Motions and FK98. We only polished the OD and the face lightly with Scotch Brite as instructed by our sensei, broke em in with green Kendall 40W, and went thru Canton filter with a fine tooth comb all the time looking for grey fuzz.... which never showed.
Hope this helps.

[stealth67vw]

I put 60,000 miles on a set, up against an Engle W125 and Bugpack 4047 dual springs. 2 were very lightly pitted but those were in egged out lifter bores.

[Jim Ratto]

I put 60,000 miles on a set, up against an Engle W125 and Bugpack 4047 dual springs. 2 were very lightly pitted but those were in egged out lifter bores.

yeah but you drove like a great grandpa. Shifting @ 2300rpm and all. 

[stealth67vw]

I put 60,000 miles on a set, up against an Engle W125 and Bugpack 4047 dual springs. 2 were very lightly pitted but those were in egged out lifter bores.

yeah but you drove like a drunk grandpa Shifting @ 7300rpm and all. 

Fixed it for you.

[Diederick/DVK]

what's the difference between 4046 and 4047 bugpack springs?

[Jim Ratto]

wire diameter and how far they will lift before coil bind

[stealth67vw]

4047s have a thicker wire gage (.162" vs. .156"). The 4046s will allow more lift (.630" vs. .550") I can't comment on spring pressure as I don't own a Rimac....yet.